Description:

Net::OpenSSH is a secure shell client package implemented on top of
OpenSSH binary client (ssh).

This package is implemented around the multiplexing feature found in
later versions of OpenSSH. That feature allows one to run several
sessions over a single SSH connection (OpenSSH 4.1 was the first one
to provide all the required functionality).

When a new Net::OpenSSH object is created, the OpenSSH ssh client is
run in master mode, establishing a persistent (for the lifetime of the
object) connection to the server.

Then, every time a new operation is requested a new ssh process is
started in slave mode, effectively reusing the master SSH connection
to send the request to the remote side.